Air and gas engine.



I Pat ented Jan. 30, I900.

J. W. EISENHUTH.

AIR AND GAS ENGINE.

Application filed June 15, 1899.)

No Model.)-

INVENTOR WITNESSES m: ucmms FiYERS ca. mo'raumo" wasmnorcn. n c.

UNITED STATES PATENT OFFICE.

JOHN \V. EISENHUTH, OF NEW YORK, N. Y., ASSIGNOR TO MAMIE G. READ, OFSAME PLACE.

AIR AND GAS ENGINE.

SPECIFICATION forming part of Letters Patent No. 642,434, dated January30, 1900.

- Application filed June 15, 1899. Serial No. 720,724. (No model.)

To all whom, it may concern:

Be it known that I, JOHN W. EISENHUTH, a citizen of the United States,residing at New York, in the county of New York and State of New York,have invented certain new and useful Improvements in Air and GasEngines; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appert-ains to make and use the same.

My invention relates to air and gas engines, and particularly to thatclass of gas-engines which are known as compound gas-engines.

It consists in an engine having high and low pressure cylinders adaptedto be operated by an explosive compound, air-cylinders arranged intandem with the gas-cylinders, and means for admitting compressed air tothe said cylinders for assisting in the operation of the gas-engine.

It also consists'in certain other novel constructions, combinations, andarrangements of parts, as will be hereinafter fullydescribed andclaimed.

In the accompanying drawings, Figure 1 represents a verticallongitudinal section through an engine constructed in accordance with myinvention. Fig. 2 represents a vertical transverse section through oneof the high-pressure cylinders of the same, and Fig. 3 represents adetail sectional view illustrating a difierent manner of operating oneof the air-cylinder valves.

The portion of my improved engine which is adapted to be operated by anexplosive mixture is the same as that described and claimed by me inanother application,filed June 14, 1899, Serial No. 720,593.

1 in the drawings represents a gas-engine; 2 2, high pressure cylinders,and 3 a lowpressure cylinder.

The explosive mixture is admitted into the cylinders 2 2 for operatingthe pistons 4 4, mounted therein, and suitable valves and portscontrolling the said admission of the explosive compound and theconveying of the exhausted gases into the low pressure As illustrated inthe drawings, the explosive gas mixture is introduced into thehighpressure cylinders through branch piping, as 25, which lead tovalve-casings, as at 26 26. Suitable valves are located in these casingsand control the admission of the explosive mixtures through the saidcasings into each of the highpressure cylinders. The passages controlledby the valves are also provided with ports, as 27, which lead from eachof the said passages into the low-pressure cylinder. Suitable valves, as28, control the exhaust from the high-pressure cylinders into the saidlow-pressure cylinder.

The upper ends of the cylinders 2 are provided with extension-cylinders5 5, which are adapted to receive extension-pistons, as 6 6, carried bythe pistons 4 4. The pistons 6 6 are considerably smaller than thepistons 4 and are preferably made integral therewith. The upper end ofeach extension-cylinder 5 is provided with a valve-chamber, as 7 ,whichis provided with an air-inlet valve 8 and an exhaust-outlet valve 9.Compressed air or other expansive agency is admitted to thevalve-chamber 7 through a suitable pipe, as at 10. The stem of the valve8 extends downwardly outside the valve-casing, 7 and is adapted at itslower end to engage a cam, as 11, secured to a' shaft 12, theconstruction being such that when the cam 11 is revolved in conjunctionwith the other mechanism of the engine the valve 8 will be raised at theproper time to admit air-pressure into the upper end of the cylinder 5.The exhaustoutlet valve 9 is provided with a hollow stem, as 13, whichsurrounds the stem of the Valve 8 and is adapted to engage at its lowerend a second cam 14, arranged upon the shaft 12. The valve 9 is normallyheld upon its seat by means of a spring, as 15, surrounding its standardand engaging a collar formed thereon. The cam 14 is so timed withrespect to the operation of the engine as to raise the valve 9 when itis desired to permit the escape of the exhaust from the cylinder 5. Theexhaust is conducted from the valve-chamber 7 into the low-pressurecylinder 3 by means of an exhaust-pipe 16, so that the exhaust of theair may be further utilized for assisting in the operation of thelowpressure piston in the said cylinder. It will be noted that the shaft12 extends from one cylinder to the other and is adapted to operate thevalves of both cylinders 5 at the proper time.

Instead of using two valves, as 8 and 9, I

may, if found desirable, employ a single slide-' valve 17, as shown inFig. 3, which is adapted to slide in the valve-chest 18. Suitable ports,as 19 and 20, connect the valve-chest 18, respectively, with thecylinder 5 and the low-pressure cylinder 3. A cam upon the shaft 21operates the slide-valve 17 in the usual manner. .When the slide-valve17 is in its lower position, the compressed air or other expansiveagency in the valvechest 18 is admitted through the port 19 into the topof the cylinder 5 and will force the piston 6 downwardly. When the valve17 is lifted, it will close the port 19 to the valve-chest 18 andconnect it with a port 20, so that the exhaust may pass through the sameand through an exhaust-pipe 22 into the cylinder 3. It will be seen thatpistons arranged thus upon the high pressure cylinders, so as to operatein conjunction therewith and have their exhausts connected with thelow-pressure cyli nder, may be efficient aids in the operation of acompound gas-engine. The parts are simple in construction and there isno need for packinglands, the usual packing-rings only being employedupon the pistons t and 6 to make them snug in their respectivecylinders.

The casing connecting the cylinders 2 2 is preferably arranged so as tocompletely inolose the crank-shaft of the engine. A partition, as 30, ispreferably mounted in one end of the casing, so as to form a compartmentin the said casing beneath one of the cylinders 2. A valve, as 31, isadapted to open inwardly for admitting the exhaust from anexhaust-chamber 32, which is connected with an exhaust-pipe of thelow-pressure cylinder. It will be seen that because of this constructionwhen the piston 4 moves up and down it will pump the exhaust from thechamber 32 into the casing of the engine and will then force the sameout through a valve, as 33, suitably located in the said casing.

It will be apparent that not only compressed air but other expansivesubstances may be used in the cylinders 5 to assist in the operation ofthe gas-engine.

It will be observed that an engine constructed in accordance with thepresent invention is practically a double compound engine. This is so,as will be readily seen, particularly in that it employs twogas-cylinders of high pressure and alow-pressure cylinder for receivingthe exhaust thereof and that it employs two air-cylinders of highpressure and also has a low-pressure cylinder into which they exhaust.It will be further observed that I use one large low-pressure cylinderto receive the exhaust both from the high-pressure gas-cylinders and thehigh-pressure aircylinders and that the exhaust from the lowpressurecylinder is removed by means of a vacuum-chamber, as above described.

Having now described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

l. In a gas-engine, the combination with a suitable casing, ofhigh-pressu re cylinders formed therein, a low pressure cylinder formedin the said casing between the highpressure cylinders, pistons movin ginthe said high-pressure cylinders, reduced cylindrical extensions formedupon the said pistons and extending into reduced extended portions ofthe cylinders, the said reduced cylindrical portions forming pistons inthe said cylinder extensions, valves for admitting compressed air intothe cylinder extensions for operating small pistons, means for admittingan explosive mixture into the high-pressure cylinders, and means forintroducing the exhaust from both high-pressure cylinders and thecompressed-air cylinders into the low-pressure cylinder, substantiallyas described.

2. In an air and gas engine, the combination of two high-pressuregas-cylinders, a lowpressure cylinder mounted between them, twohigh-pressure air-cylinders, means for connectin g the high-pressuregas-cylinders with the low-pressure cylinder and means for connectingthe high-pressure air-cylinders with the said low-pressure cylinder, theconstruction being such that each of the high-pressure gas-cylinders andair-cylinders will exhaust into the said low-pressure cylinder,substantially as described.

In testimony whereof I hereunto affix my signature in presence of twowitnesses.

JOHN IV. EISENHUTH.

Witnesses:

GEO. W. EVERITT, O. H. GRAHAM.

